Air conditioning recharge

Hi there, I went and purchased a recharge can for my 1995 Honda Civic. I read the instructions and they said to turn on the AC to high and hook up the recharge adapter and check the pressure. If the pressure was in the "Warning" 65-200 psi area not to fill with the re-charge kit and there are other problems with the system. The pressure read 100 psi on the gauge.

What could be wrong? The AC is blowing out just warm/hot air.

Thanks.

leak? dunno, my ac is leaking pretty badly, gonna have to find out where though